diff --git a/plugin.js b/plugin.js
index 8aec1ca..7fc28b2 100644
--- a/plugin.js
+++ b/plugin.js
@@ -40,9 +40,9 @@ function fastifyCookieSetCookie (reply, name, value, options) {
 
 function fastifyCookieClearCookie (reply, name, options) {
   const opts = Object.assign({ path: '/' }, options, {
-    expires: new Date(1),
-    signed: undefined,
-    maxAge: undefined
+    expires: new Date(0),
+    maxAge: 0,
+    signed: false
   })
 
   return fastifyCookieSetCookie(reply, name, '', opts)
diff --git a/test/cookie.test.js b/test/cookie.test.js
index 7f277f1..77e1c22 100644
--- a/test/cookie.test.js
+++ b/test/cookie.test.js
@@ -224,7 +224,7 @@ test('share options for setCookie and clearCookie', (t) => {
     t.equal(cookies.length, 1)
     t.equal(cookies[0].name, 'foo')
     t.equal(cookies[0].value, '')
-    t.equal(cookies[0].maxAge, undefined)
+    t.equal(cookies[0].maxAge, 0)
 
     t.ok(new Date(cookies[0].expires) < new Date())
   })
@@ -1054,7 +1054,7 @@ test('clearCookie should include parseOptions', (t) => {
     t.equal(cookies.length, 1)
     t.equal(cookies[0].name, 'foo')
     t.equal(cookies[0].value, '')
-    t.equal(cookies[0].maxAge, undefined)
+    t.equal(cookies[0].maxAge, 0)
     t.equal(cookies[0].path, '/test')
     t.equal(cookies[0].domain, 'example.com')